"Idiopathic" scoliosis associated with congenital upper-limb deficiency.

Sixty patients with congenital upper-limb deficiency were evaluated for scoliosis in 1972. Twenty-one patients had scoliosis of 5 degrees or more and 15 had scoliosis of 10 degrees or more. Fifteen of these patients had long-term follow-up periods. Thirteen patients had idiopathic scoliosis. Idiopathic scoliosis associated with congenital upper-limb deficiency could be divided into three groups, and the progression of scoliosis was predictable within each group. All but one of these patients had a relatively benign course and did not require treatment. Double curves with rotation progressed throughout the growth period. Double curves with Grade 0 rotation tended not to be progressive. Single curves did not have rotation deformity and resolved spontaneously or remained stable. Magnitude of limb deficiency did not correlate with the curve magnitude, progression, or pattern. Muscle imbalance did not appear implicated as a cause for the scoliosis in these patients. Young age at discovery of the curve did not correlate with progression of the curve.